KR102463396B1 - Energy storage system - Google Patents

Abstract

An energy storage system according to an embodiment includes a power generation device for generating electrical energy; an energy storage device that converts electrical energy generated through the power generator and charges or outputs the converted electrical energy; and a load operating by using electric energy output through the energy storage device as driving power, wherein the energy storage device outputs electric energy of DC power, and the load directly outputs through the energy storage device It operates by using the electric energy of the direct current power as driving power.

Description

Energy storage system {ENERGY STORAGE SYSTEM}

The present invention relates to an energy storage system, and more particularly, to an energy storage system that is integrally formed with a load and can directly supply DC power instead of AC power to the load.

An energy storage system is a system that increases energy efficiency by storing generated power in each linked system including a power plant, substation, and transmission line, and then selectively and efficiently using it when power is needed.

The energy storage system can lower the power generation unit cost and reduce the investment and operation cost required for power facility expansion, reducing the electricity rate and saving energy when the overall load factor is improved by leveling the electric load with large fluctuations by time and season. can do.

Such an energy storage system is installed and used in power generation, transmission and distribution, and at consumers. Frequency regulation, stabilization of generator output using new and renewable energy, peak shaving, and load leveling , emergency power supply, etc.

Energy storage systems are largely divided into physical energy storage and chemical energy storage according to storage methods. For physical energy storage, there is a method using pumped water power generation, compressed air storage, flywheel, etc., and for chemical energy storage, there is a method using a lithium-ion battery, a lead-acid battery, or a Nas battery.

Such an energy storage system supplies power by discharging the charged power when power is needed. Through this, the energy storage system can provide power flexibly.

Specifically, the energy storage system including the power generation system operates as follows. The energy storage system discharges the stored electrical energy when the load or grid is overloaded. In addition, when the load or the grid is a light load, the energy storage system is charged by receiving power from the power generation device or the grid.

In addition, when the energy storage system independently exists regardless of the power generation system, the energy storage system is charged by receiving idle power from an external power source. In addition, when the grid or load is overloaded, the energy storage system supplies power by discharging the charged power.

An embodiment according to the present invention provides an energy storage system capable of supplying power for driving a repeater and a camera by using the power generated by the power generator and charging the battery using the remaining power at the same time.

The technical tasks to be achieved in the proposed embodiment are not limited to the technical tasks mentioned above, and other technical tasks not mentioned are clear to those of ordinary skill in the art to which the proposed embodiment belongs from the description below. will be able to understand

An energy storage system according to an embodiment includes a power generation device for generating electrical energy; an energy storage device that converts electrical energy generated through the power generator and charges or outputs the converted electrical energy; and a load operating by using electric energy output through the energy storage device as driving power, wherein the energy storage device outputs electric energy of DC power, and the load directly outputs through the energy storage device It operates by using the electric energy of the direct current power as driving power.

According to an embodiment of the present invention, by supplying power to a load composed of a repeater and a camera using the power generated by the power generator, it is possible to supply stable power to the load in an area where independent power is not available.

In addition, according to the embodiment of the present invention, since the final output of the energy storage device is DC power instead of AC power, an inverter that is essential to be included in a load such as a repeater can be eliminated, thereby reducing product cost and slimming the product volume.

In addition, according to an embodiment of the present invention, when the operation of the battery management system is stopped due to the complete discharge of the battery, the driving power of the battery management system is preferentially supplied using the power generated through the power generation device, An additional operation for resuming the operation of the battery management system is unnecessary, and a system abnormality occurring according to the operation stop of the battery management system may be prevented in advance.

1 is a diagram showing a schematic configuration of an energy storage system according to an embodiment of the present invention.
2 is a detailed configuration diagram of the energy storage device 200 according to the first embodiment of the present invention.
3 is a view showing a detailed configuration of a load according to an embodiment of the present invention.
4 is a view showing the configuration of the first repeater and the second repeater shown in FIG.
5 is a diagram showing output power of each converter of the energy storage device 200 according to an embodiment of the present invention.
6 to 11 are diagrams illustrating a flow of power supply according to each operation mode of the energy storage device 200 according to an embodiment of the present invention.
12 shows an operation mode according to a state of charge of a battery according to an embodiment of the present invention.
13 is a diagram illustrating a power supply flow to a load according to an embodiment of the present invention.
14 is a detailed configuration diagram of an energy storage device 200 according to a second embodiment of the present invention.
15 to 17 are flowcharts for explaining step-by-step an operating method of an energy storage system according to an embodiment of the present invention.

Hereinafter, embodiments related to the present invention will be described in more detail with reference to the drawings. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

In describing the embodiments of the present invention, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

Combinations of each block in the accompanying drawings and each step in the flowchart may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions executed by the processor of the computer or other programmable data processing equipment may correspond to each block in the drawings or each of the flowcharts. Steps will create a means for performing the functions described. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible to produce an article of manufacture containing instruction means for performing the functions described in each block of the figure or in each step of the flowchart, the instructions stored in the . The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that the instructions for performing the processing equipment provide steps for carrying out the functions described in each block of the figure and each step of the flowchart.

Further, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function(s). It should also be noted that, in some alternative embodiments, it is possible for the functions recited in blocks or steps to occur out of order. For example, it is possible that two blocks or steps shown one after another may in fact be performed substantially simultaneously, or that the blocks or steps may sometimes be performed in the reverse order according to the corresponding function.

1 is a diagram showing a schematic configuration of an energy storage system according to an embodiment of the present invention.

Referring to FIG. 1 , the energy storage system includes a power generation device 100 , an energy storage device 200 , and a load 300 .

The generator 100 generates electrical energy. The power generation device 100 may be a solar power generation device, or alternatively, a wind power generation device.

When the power generation device 100 is a photovoltaic device, the power generation device 100 may be a solar cell array.

A solar cell array is a combination of a plurality of solar cell modules. A solar cell module is a device that converts solar energy into electrical energy by connecting a plurality of solar cells in series or in parallel to generate a predetermined voltage and current. Thus, the solar cell array absorbs solar energy and converts it into electrical energy.

In addition, when the power generator 100 is a wind power generator, the power generator 100 may be a fan that converts wind energy into electrical energy.

Meanwhile, the power generation device 100 is not limited thereto, and may be configured as a tidal power generation device in addition to the solar power generation device and the wind power generation device. However, this is an example, and the power generation device 100 is not limited to the above-mentioned types, and may include all power generation systems that generate electrical energy using renewable energy, such as solar heat or geothermal heat.

The energy storage device 200 supplies charging power for charging the battery 240 or driving power for driving the load 300 using the electrical energy converted through the power generation device 100 .

To this end, the energy storage device 200 includes a power conversion unit constituting a Power Condition System (PCS) and an energy storage unit constituting an Energy Storage System (ESS).

The power conversion unit is connected to the power generation device 100, receives the DC power output from the power generation device 100, and uses the received DC power to supply the charging power and the driving power. Includes a DC converter.

The energy storage unit may be connected to a specific DC-DC converter of any one of the plurality of DC-DC converters to perform a charging operation according to power output through the connected DC-DC converter, or to transmit power to another DC-DC converter It includes a battery 240 that performs a discharging operation for supply, and a battery management system (BMS) 250 that manages the state of the battery 240 .

The load 300 consumes power by receiving electrical energy from the energy storage device 200 . In an embodiment, the load 300 may be integrally formed with the energy storage device 200 , and thus may consume electric power by receiving electrical energy supplied through the energy storage device 200 .

Preferably, the load 300 is a repeater for relaying a signal between a mobile communication terminal (not shown) and a mobile communication server (not shown), and is installed at a location where the repeater is installed to photograph the surrounding state of the repeater. includes a camera that

The energy storage system according to the present invention may be installed in a location such as a mountainous area classified as a shaded area. Preferably, the power generation device 100 is installed on a structure such as a pedestal, and the energy storage device 200 is installed on the floor in consideration of weight and the like.

Hereinafter, the energy storage system configured as described above will be described in more detail.

2 is a detailed configuration diagram of the energy storage device 200 according to the first embodiment of the present invention.

Referring to FIG. 2 , the energy storage device 200 includes a first converter 210 , a second converter 220 , a third converter 230 , a battery 240 , a BMS 250 , and a system controller 260 . include

One end of the first converter 210 is connected to the generator 100 , and the other end is connected to the second converter 220 , the third converter 230 and the battery 240 . In addition, the other end of the first converter 210 may be further connected to the BMS 250 according to an embodiment.

The first converter 210 converts the voltage of the DC power output through the power generator 100 . That is, the first converter 210 is a DC-DC converter, and accordingly converts the DC power of the first level output through the generator 100 into the DC power of the second level.

That is, in order to input the power supplied by the power generator 100 to the battery 240 , the second converter 220 , and the third converter 230 , step-down is required. Accordingly, the first converter 210 can input the voltage of the power produced by the power generation device 100 to the second converter 220 , the third converter 230 and the battery 240 . converted to the magnitude of the voltage.

For example, the voltage of the DC power generated by the power generator 100 may be 120V, and accordingly, the first converter 210 steps down the voltage of the DC power to 52V and outputs it.

Meanwhile, the first converter 210 may further include a rectifying circuit (not shown) for converting the AC power into DC power when the power output from the power generation device 100 is AC power.

In addition, the first converter 210 is a maximum power point tracking (MPPT: Maximum Power Point Tracking) control so as to obtain the maximum power produced by the power generation device 100 according to changes in insolation, temperature, wind speed, etc. It may include an MPPT converter that performs. Meanwhile, the first converter 210 may minimize power consumption when there is no power generated by the power generation device 100 .

The second converter 220 has one end connected to the first converter 210 and the battery 240 , and the other end connected to the load 300 .

The second converter 220 converts a voltage of DC power output through the first converter 210 or a voltage of DC power output through the battery 240 . The second converter 220 is a DC-DC converter that converts DC power of a first level into DC power of another level.

That is, in order to input the power output from the first converter 210 and/or the battery 240 to the load 300 , conversion into a voltage required by the load 300 must be performed.

Accordingly, the second converter 220 converts the voltage of the DC power output from the first converter 210 and/or the battery 240 into a voltage required by the load 300 .

For example, the second converter 220 may receive a DC power of 52V from the first converter 210 and/or the battery 240 through the one end, and thus the load 300 and It is possible to output 48V DC power to the other end connected.

The third converter 230 has one end connected to the first converter 210 and the battery 240 , and the other end connected to the load 300 .

The third converter 230 converts the voltage of the DC power output through the first converter 210 or the voltage of the DC power output through the battery 240 . The third converter 230 is a DC-DC converter that converts DC power of a first level into DC power of another level.

That is, in order to input the power output from the first converter 210 and/or the battery 240 to the load 300 , conversion into a voltage required by the load 300 must be performed.

Accordingly, the third converter 230 converts the voltage of the DC power output from the first converter 210 and/or the battery 240 into a voltage required by the load 300 .

For example, the third converter 230 may receive a DC power of 52V from the first converter 210 and/or the battery 240 through the one end, and thus the load 300 and 27V DC power can be output to the other connected end.

One end of the battery 240 is connected to the first converter 210 , and the other end is connected to the second converter 220 and the third converter 230 .

The battery 240 receives charging power from the first converter 210 connected through the one end in the charging mode, and performs a charging operation based on the received charging power.

In addition, the battery 240 outputs the power stored in advance to the second converter 220 and the third converter 230 connected to the other end in the discharging mode.

The battery 240 includes a battery pack including a plurality of battery cells to perform the charging operation and the discharging operation.

A plurality of battery cells included in the battery pack needs to maintain a uniform voltage of each battery cell in order to obtain stability, improved lifespan, and high output.

The battery management system (BMS) 250 manages each battery cell to maintain an appropriate voltage while charging or discharging the battery cells of the battery pack.

On the other hand, it is difficult for a plurality of battery cells to stably maintain an equilibrium state due to various factors such as a change in internal impedance. have a function

For example, a difference in the state of charge (STATE OF CHARGE, hereinafter referred to as SOC) between the battery cells in the battery pack occurs due to a difference in branch discharge rates of the battery cells in the battery pack over time. In order to overcome such a capacity imbalance between the battery cells, a separate circuit for charging (BOOST) and/or discharging (BUCK) is configured for each battery cell.

The battery cells in the battery pack as described above may be managed by the battery management system (BMS, 250) to maintain a constant voltage, and may emit a constant voltage by the battery management system (BMS, 250).

For example, the battery management system (BMS) 250 may detect voltages of the battery cells and transmit them to the system controller 260 . In addition, when the battery voltage falls below the lower limit, the system controller 260 may supply the DC power output through the first converter 210 to the battery 240 . Also, when the battery voltage rises above the upper limit, the system controller 260 may supply the power charged in the battery 240 to the second converter 220 and the third converter 230 .

The battery cells constituting the battery 240 are preferably configured as secondary batteries capable of charging and discharging, but are not limited thereto.

Meanwhile, the battery management system (BMS) 250 may monitor the battery state including the SOC level, which is the state of charge of the battery 240 . In addition, the battery management system (BMS) 250 may transmit battery state information on the state of the battery 240 to the system controller 260 . For example, the battery management system (BMS, 250) monitors at least one of voltage, current, temperature, remaining power, lifespan, and charging state of the battery 240, and the monitored state information of the battery 240 may be transmitted to the system controller 260 .

In addition, the battery management system (BMS, 250) performs at least one function of an overcharge protection function, an overdischarge protection function, an overcurrent protection function, an overvoltage protection function, and an overheat protection function for the battery 240 in addition to the balancing function. can do.

Also, the battery management system (BMS) 250 may adjust the SOC level of the battery 240 . Specifically, the battery management system (BMS, 250) may receive a control signal from the system controller 260, and adjust the SOC level of the battery 240 based on the received control signal.

The system controller 260 controls power conversion operations of the first converter 210 , the second converter 220 , and the third converter 230 , and controls charging and discharging operations of the battery 240 .

When the load 300 is overloaded, the system controller 260 causes the battery 240 to be discharged, so that the driving power of the load 300 is supplied by the power output by the discharging of the battery 240 . make it possible In this case, the system controller 260 may control the power output from the battery 240 to be supplied to the second converter 220 and the third converter 230 .

In addition, when the load 300 is a light load, the system controller 260 supplies the DC power converted by the first converter 210 to the battery 240 , and uses the supplied DC power to the battery 240 . ) to control the charging. In this case, the system controller 260 may control the operation mode (charging mode and discharging mode) of the battery 240 according to a state of charge (SOC) of the battery 240 .

Meanwhile, the system controller 260 stores the operating condition information of the load 300 and controls the power supplied to the load 300 based on the stored operating condition information. The operating condition information may include driving time information of the load 300 , and the system control unit 260 uses the load 300 only for a time when the operation of the load 300 is required according to the driving time information. Make sure that the driving power is supplied.

Also, the system controller 260 may compare the power output from the first converter 210 with an output command value, and control the path of the power output from the first converter 210 according to the comparison result. Here, the output command value may mean a driving power value required by the load 300 , that is, a command value for output power to be output to the load 300 .

For example, when the power output from the first converter 210 exceeds the output command value, the system control unit 260 may adjust the difference between the power output from the first converter 210 and the output command value. Corresponding power may be supplied to the battery 240 to control the charging of the battery 240 . Accordingly, the battery 240 operates in a charging mode, and the second converter 220 and the third converter 230 respond to the output command value based on the power output through the first converter 210 . Corresponding power may be supplied to the load 300 .

In addition, when the power output from the first converter 210 is less than the output command value, the system control unit 260 corresponds to a difference value between the power output from the first converter 210 and the output command value It is possible to control the battery 240 so that the electric power is discharged. Accordingly, the battery 240 may operate in a discharging mode.

In addition, the second converter 220 and the third converter 230 convert the power output through the first converter 210 and the battery 240 to an output command value required by the load 300 . output the corresponding power.

In this way, the system controller 260 may control the overall operation of the energy storage device 200 and determine the operation mode of the energy storage device 200 accordingly.

The operation mode of the energy storage device 200 includes a first operation mode in which driving power of the load 300 is supplied using the power generated by the power generation device 100 , and a first operation mode in which the power generation device 100 generates A second operation mode for supplying charging power of the battery 240 and driving power of the load 300 using power, and using the power generated by the power generator 100 and the power charged in the battery 240 . a third operation mode for supplying driving power to the load 300 , a fourth operation mode for supplying charging power of the battery 240 using the power generated by the power generation device 100 , and the battery A fifth operation mode in which driving power is supplied to the load 300 using the power charged in 240, and a first operation mode in which neither the charging power of the battery 240 nor the driving power of the load 300 is supplied Includes 6 operating modes.

The system control unit 260 sets the operation mode of the energy storage device 200 in consideration of the amount of power generation of the power generation device 100 , the state of charge of the battery 240 , the operating conditions of the load 300 , and the like. Any one of 1 to 6 operation modes is set, and the operations of the first converter 210 , the second converter 220 , the third converter 230 and the battery 240 are performed according to the set operation mode. control to make it happen.

In addition, the system controller 260 may output a control signal for controlling the switching operation of the switching elements constituting the first to third converters 210 , 220 , 230 according to the set operation mode. Here, the control signal may mean a signal capable of minimizing a loss due to power conversion of each converter through optimal control of a duty ratio according to an input voltage of each converter. To this end, the system control unit 260 detects voltage, current, and temperature values from at least one of an input terminal and an output terminal of each converter, and generates and outputs the control signal based on the detected voltage, current, and temperature values. can do.

In addition, the system controller 260 checks the state of charge of the battery 240 and controls the supply of driving power to the battery management system (BMS, 250 ) according to the checked state of charge.

That is, the battery management system (BMS, 250) receives power required for driving from the battery 240, and controls the operation of the battery 240 based on the received power or monitors the state of the battery 240. monitor

At this time, when the output command value for the power to be supplied to the load 300 is high or the power output from the power generation device 100 is low, the battery 240 does not operate in the charging mode, and does not operate in the discharging mode or the sleep mode. mode will work. And, when the SOC level of the battery 240 falls below a predetermined minimum reference value (eg, 5%) due to the continuous operation in the discharging mode or the sleep mode as described above, the battery 240 operates will shut down.

In this case, the battery management system (BMS, 250) is not supplied with driving power due to the stop of the battery 240, and accordingly, the battery 240 cannot operate normally.

Accordingly, when the operation of the battery 240 is stopped as described above, the system control unit 260 determines whether the power output from the power generation device 100 is present, and outputs the power output from the power generation device 100 . When power is present, the driving power of the battery management system (BMS) 250 is preferentially supplied by the power converted through the first converter 210 .

In addition, the system control unit 260 causes the battery management system (BMS, 250) to be driven by the supplied driving power, and accordingly, charging of the battery 240 by the battery management system (BMS, 250) is performed. make it happen

In addition, when the state of charge of the battery 240 reaches an SOC level greater than or equal to a certain level, the system controller 260 may control the driving power of the battery management system (BMS, 250) by the power charged in the battery 240 . to be re-supplied.

That is, when the battery 240 is stopped in operation, the entire system is reset for normal operation of the battery 240 or the operation of the battery management system (BMS, 250) is normally performed through a separate additional operation. to be carried out. However, in the present invention, as described above, the subject for supplying driving power to the battery management system (BMS, 250) is differently set according to the state of the battery 240 to solve the above problems.

According to an embodiment of the present invention, by supplying power to a load composed of a repeater and a camera using the power generated by the power generator, it is possible to supply stable power to the load in an area where independent power is not available.

In addition, according to the embodiment of the present invention, since the final output of the energy storage device is DC power instead of AC power, an inverter that is essential to be included in a load such as a repeater can be eliminated, thereby reducing product cost and slimming the product volume.

In addition, according to an embodiment of the present invention, when the operation of the battery management system is stopped due to the complete discharge of the battery, the driving power of the battery management system is preferentially supplied using the power generated through the power generation device, An additional operation for resuming the operation of the battery management system is unnecessary, and a system abnormality occurring according to the operation stop of the battery management system may be prevented in advance.

3 is a view showing a detailed configuration of a load according to an embodiment of the present invention.

Referring to FIG. 3 , the load 300 includes a camera 310 , a first repeater 320 , and a second repeater 330 .

The camera 310 is disposed at a location where the load 300 is installed, acquires an image of the surrounding situation of the load 300 , and transmits the acquired image to the system controller 260 .

The camera 310 may be connected to an output terminal of the third converter 230 , and thus may be driven by DC power converted through the third converter 230 .

In addition, the camera 310 is interlocked with the operations of the first repeater 320 and the second repeater 330, and is selective only when the first repeater 320 and the second repeater 330 are driven. can operate as

The first repeater 320 and the second repeater 330 are a kind of load 300 and perform signal relay between the mobile communication terminal and the mobile communication server.

In general, communication between the mobile communication terminal and the mobile communication server cannot be smoothly performed in a mountainous area classified as a shaded area. repeater is installed.

In this case, the repeater is driven by receiving a separate system power, and thus there is a lot of difficulty in controlling the power of the repeater.

Accordingly, in the present invention, as described above, the load 300 including the energy storage device 200 and the repeater is designed as one system, and accordingly, the load The driving power is supplied to the repeater constituting the 300 .

The repeater may include a first repeater 320 and a second repeater 330 according to product specifications.

The first repeater 320 may be a Radio Remote Head (RRH), and its specifications may be as shown in Table 1 below.

More information product name RRH(L8HU) Dimension(mm/WxDxH) 350.5*125*465 Input voltage (V) +27DC Input current (A) 6.45A Power consumption (W) 175

The first repeater 320 is connected to the third converter 230 , receives DC power converted through the third converter 230 , and is driven by the received DC power.

In addition, the second repeater 330 may be a mmWave repeater, and the specification thereof may be as shown in Table 2 below.

More information product name mmWave Dimension(mm/WxDxH) 265*265*80 Input voltage (V) -48DC Input current (A) 1A Power consumption (W) 55

The second repeater 330 is connected to the second converter 220 , receives DC power converted through the second converter 220 , and is driven by the received DC power.

In addition, the operating conditions of the load 300 controlled by the system controller 260 may be as shown in Table 3 below.

1st repeater (180W) 2nd repeater (60W) Operating Hours/Day 12 Required Energy/Days 180W*12hr=2160W 60W*12hr=720W Controller Consumption 2W*24h=48Wh Power Conversion Efficiency > 85% Daily Consumption Energy 2160/0.85+48=2590W 720/0.85+48=895W Generator standard 300W*6=1800W Sunshine 4hr/day Sunless Days 1 day Battery Operation Range (SOC) 10-90% Required Battery Capacity 7843Wh Output 300W Operating Temperature -10~40℃

As shown in Table 3, the system control unit 260 sets the operating conditions of the load 300, and the operating state of each converter, the operating state of the battery 240, and power generation so as to satisfy the above operating conditions. An operation plan including the power generation state of the device 100 is established, and the energy storage device 200 is operated according to the established operation plan.

4 is a view showing the configuration of the first repeater and the second repeater shown in FIG.

Referring to FIG. 4 , any one of the first repeater and the second repeater includes a DC-DC converter 321 , an amplifier 322 , and a controller 323 .

The repeater as described above receives DC power from the energy storage device 200 . That is, in the conventional repeater, an inverter is disposed at a power input terminal, AC power is supplied from the outside, and the AC power is converted into DC power through the inverter.

However, in the present invention, DC power is output through the energy storage device 200 as described above, and thus the output DC power is directly received through the repeater, and the inverter provided in the repeater has been deleted. .

Accordingly, the amplifier 322 is driven by the power output through the energy storage device 200 .

In addition, the power output through the energy storage device 200 is input to a DC-DC converter 321, and the DC-DC converter 321 requires the input power from each component constituting the repeater. converted to power.

That is, the DC-DC converter 321 steps down the DC power of 27V or 48V output from the energy storage device 200 to 5V or 12V according to the required power of the controller 323 for controlling the overall operation of the repeater. do.

5 is a diagram showing output power of each converter of the energy storage device 200 according to an embodiment of the present invention.

Referring to FIG. 5 , as shown in (a), the first converter 210 receives DC power of 120V from the generator 100 . In addition, the first converter 210 converts the 120V DC power into 52V DC power according to an operation mode, and converts the converted DC power to the second converter 220 , the third converter 230 and each output to the battery 230 .

In addition, as shown in FIG. 5B , the second converter 220 receives the DC power of 52V from the first converter 210 and the battery 240 . In addition, the second converter 220 converts the 52V DC power into 48V DC power according to an operation mode, and outputs the converted DC power to the second repeater 330 , respectively.

In addition, as shown in FIG. 5C , the third converter 230 receives the DC power of 52V from the first converter 210 and the battery 240 . In addition, the third converter 230 converts the 52V DC power into 27V DC power according to an operation mode, and outputs the converted DC power to the first repeater 320 and the camera 310, respectively. do.

6 to 11 are diagrams illustrating a flow of power supply according to each operation mode of the energy storage device 200 according to an embodiment of the present invention.

6 shows a power supply flow that appears when the operation mode of the energy storage device 200 is the first operation mode in which the driving power of the load 300 is supplied using the power generated by the power generator 100 . .

Referring to FIG. 6 , the first operation mode is a time required to drive the load 300 , and may be performed when the output command value of the load 300 and the amount of power produced by the generator 100 are the same. .

Accordingly, the power produced by the power generation device 100 is supplied to the first converter 210 , and power conversion is performed by the first converter 210 . Then, the DC power converted through the first converter 210 is supplied to the second converter 220 and the third converter 230, and is converted into DC power required by the load 300. output to the load 300 . At this time, the power converted through the first converter 210 is not supplied to the battery 240 , and the power charged in the battery 240 is also the second converter 220 and the third converter 230 . not supplied with

7 is a second operation mode in which the operation mode of the energy storage device 200 supplies charging power of the battery 240 and driving power of the load 300 using the power generated by the power generation device 100 . Shows the power supply flow in the case.

Referring to FIG. 7 , the second operation mode is a time required to drive the load 300 , and may be performed when the output command value of the load 300 is lower than the amount of power produced by the generator 100 . .

Accordingly, the power produced by the power generation device 100 is supplied to the first converter 210 , and power conversion is performed by the first converter 210 . Then, the DC power converted through the first converter 210 is supplied to the second converter 220 and the third converter 230, and is converted into DC power required by the load 300. output to the load 300 . At this time, the remaining power excluding the power corresponding to the output command value among the power converted through the first converter 210 is supplied to the battery 240 , and thus the battery 240 is charged.

8 is a third operation mode of the energy storage device 200 for supplying driving power to the load 300 using the power generated by the power generation device 100 and the power charged in the battery 240 . It shows the power supply flow in the case of operation mode.

Referring to FIG. 8 , the third operation mode is a time required to drive the load 300 , and may be performed when the output command value of the load 300 is higher than the amount of power produced by the generator 100 . .

Accordingly, the power produced by the power generation device 100 is supplied to the first converter 210 , and power conversion is performed by the first converter 210 . In addition, the DC power converted through the first converter 210 is supplied to the second converter 220 and the third converter 230 .

At this time, the battery 240 performs a discharging operation, and accordingly, the DC power output from the battery 240 by discharging the battery 240 is also applied to the second converter 220 and the third converter 230 . is supplied with

Accordingly, the second converter 220 and the third converter 230 receive DC power from the power generation device 100 and the battery 240 , and the load 300 requires the supplied DC power. It is output after converting each to DC power.

9 is a power supply flow shown when the operation mode of the energy storage device 200 is the fourth operation mode for supplying charging power of the battery 240 using the power generated by the power generation device 100 . show

Referring to FIG. 9 , the fourth operation mode may be performed when the driving of the load 300 is unnecessary and power generated through the power generation device 100 is present.

Accordingly, the power produced by the power generation device 100 is supplied to the first converter 210 , and power conversion is performed by the first converter 210 . In addition, all of the DC power converted through the first converter 210 is supplied to the battery 240 to charge the battery 240 . At this time, the DC power converted through the first converter 210 is not supplied to the second converter 220 and the third converter 230 , and accordingly, the second converter 220 and the third converter 230 . ) does not work.

FIG. 10 shows a power supply flow that appears when the operation mode of the energy storage device 200 is a fifth operation mode in which driving power is supplied to the load 300 using the power charged in the battery 240 .

Referring to FIG. 10 , the fifth operation mode may be performed when the time required to drive the load 300 and power generated by the power generator 100 does not exist.

Accordingly, there is no power output from the power generator 100 , so the operation of the first converter 210 is not performed, and therefore, power output through the first converter 210 does not exist.

In addition, the battery 240 outputs DC power to the second converter 220 and the third converter 230 by performing a discharging operation. Then, the second converter 220 and the third converter 230 receive DC power from the battery 240 , and convert the supplied DC power into DC power required by the load 300 , respectively. print out

11 shows a power supply flow that appears when the operation mode of the energy storage device 200 is the sixth operation mode in which neither the charging power of the battery 240 nor the driving power of the load 300 are supplied.

Referring to FIG. 11 , the sixth operation mode may be performed when the driving of the load 300 is unnecessary and power generated by the power generation device 100 does not exist.

At this time, the first converter 210 , the second converter 220 , and the third converter 230 are all in the stopped operation state, and accordingly, the battery 240 also maintains the operation stop or the operation standby state.

12 shows an operation mode according to a state of charge of a battery according to an embodiment of the present invention.

Referring to FIG. 12 , the SOC level of the battery may be divided into 0 to 100%. In addition, the SOC level may be limited to a maximum reference value of 95%, and the battery 240 maintains a normal operating state when the SOC level is within the range of 95% to 10%.

In addition, when the SOC level falls below 10%, the battery 240 operates in the standby mode until it reaches the minimum reference value of 5%.

And, when the SOC level falls below 5%, the battery 240 is in a stopped operation state.

13 is a diagram illustrating a power supply flow to a load according to an embodiment of the present invention.

Referring to FIG. 13 , when all of the energy of the battery 240 is discharged, there is a delay of a predetermined time T1 until the power generation device 100 generates sufficient power to operate the energy storage device 200 . is generated, and the size of this predetermined time T1 may be changed according to the power generation condition (eg, solar multiple condition) of the power generation device.

For example, when morning comes after consuming all the energy of the battery 240 , a period T1 is generated as shown in FIG. 13 , and the interval of T1 may change according to solar radiation time.

Accordingly, in the present invention, the system controller 260 minimizes the interval of T1 or so that the T1 interval does not exist, and the battery 240 or an additional auxiliary battery (not shown) is driven in the T1 interval. do.

That is, the system control unit 260 may determine whether the T1 period occurs based on a time point at which driving power to the load 300 should be performed. This may be determined by a timing of supplying driving power to the load 300 , a state of charge of the battery 240 , and an expected amount of power to be generated by the power generation device 100 .

Accordingly, when the T1 period occurs, the system controller 260 may solve the problem caused by the occurrence of the T1 period by driving a separate auxiliary battery or outputting information indicating that the T1 period occurs. let it be

14 is a detailed configuration diagram of an energy storage device 200 according to a second embodiment of the present invention.

Referring to FIG. 14 , the energy storage device 200 includes a first converter 210 , a second converter 220 , a third converter 230 , a battery 240 , a BMS 250 , and a system controller 260 . include Hereinafter, in the description of FIG. 14 , descriptions of components having substantially the same functions as the components shown in FIG. 2 will be omitted.

Referring to FIG. 14 , compared with the energy storage device 200 shown in FIG. 2 , the configuration of the system controller 260 and the configuration of the auxiliary battery 270 are the energy storage according to the first embodiment of the present invention. It is different from device 200 .

The energy storage device 200 according to the second embodiment of the present invention includes a first control unit 261 operating in a first charging state of a battery 240 , and a second controlling unit 261 operating in a second charging state of the battery 240 . 2 includes a control unit 262 .

The first control unit 261 performs the same function as the system control unit 260 shown in FIG. 2 , and thus a detailed description thereof will be omitted.

The first control unit 261 operates by power supplied through the battery 240 when the state of charge of the battery 240, that is, the SOC level is between 95% and 5%.

In addition, the battery management system (BMS, 250) periodically monitors the SOC level of the battery 240, and as the SOC level of the battery 240 decreases to less than 5%, the It is determined whether a situation in which normal operation cannot be performed occurs.

When the SOC level of the battery 240 falls below 5%, the battery management system (BMS, 250) stops the driving of the first control unit 261, and accordingly, the first control unit 261 The operation control of the energy storage device 200 is controlled by the second control unit 262 instead of .

To this end, when the SOC level of the battery 240 drops to less than 5%, the battery management system (BMS) 250 drives the auxiliary battery 270 to discharge the auxiliary battery 270 . .

In addition, the battery management system (BMS) 250 supplies driving power to the second control unit 262 by power generated by discharging of the auxiliary battery 270 .

Accordingly, the second controller 262 is driven according to the power supplied from the auxiliary battery 270 to control the operations of the first converter 210 , the second converter 220 , and the third converter 230 . do.

As described above, in the present invention, the system control unit 260 is composed of a plurality of control units, and accordingly, the plurality of control units operate separately from each other according to the SOC level of the battery 240 . Accordingly, the energy storage device 200 according to the present invention can accurately recognize the state of charge of the battery 240 , and can correct the operation error of the energy storage device 200 that occurs according to the state of charge of the battery 240 . to prevent it in advance.

15 to 17 are flowcharts for explaining step-by-step an operating method of an energy storage system according to an embodiment of the present invention.

First, referring to FIG. 15 , the power generation device 100 generates electric energy (step 100 ).

Then, the system control unit 260 determines whether power supply to the load 300 is necessary (step 110). That is, the system control unit 260 determines whether power supply to the load 300 is required based on whether the current time is the time when power should be supplied to the load 300 and whether the load 300 is an overload or a light load. judge

Subsequently, if it is not necessary to supply power to the load 300 , the system control unit 260 supplies power according to the electrical energy generated through the power generation device 100 to the battery 240 to the battery 240 . is charged (step 120). Accordingly, the first converter 210 receives the power generated by the power generation device 100 , and thus performs the conversion operation of the power and supplies it to the battery 240 . At this time, the power converted through the first converter 210 is not supplied to the second converter 220 and the third converter 230, and accordingly, at the time point, the second converter 220 and the third converter ( 230) does not work.

In addition, when power supply is required to the load 300 , the system controller 260 determines whether the battery 240 needs to be discharged (step 130 ). That is, the system controller 260 may determine whether the battery 240 needs to be discharged because the power demand of the load 300 cannot be satisfied only with the electric energy supplied by the power generation device 100 .

Then, when the battery 240 needs to be discharged, the system controller 260 controls the battery 240 to discharge the battery 240 (step 140).

Accordingly, the power converted through the first converter 210 and the power discharged through the battery 240 are selectively supplied to the second converter 220 and the third converter 230 . Then, the second converter 220 and the third converter 230 receive the supplied power, and convert the received power into DC power having a size required by the load 300 (step 150).

Then, the DC power converted through the second converter 220 and the third converter 230 is directly supplied to each component of the load 300 (step 160).

Also, referring to FIG. 16 , the system controller 260 periodically checks the SOC level of the battery 240 by communicating with the battery management system (BMS) 250 (step 200).

Then, the system control unit 260 determines whether the SOC level of the battery 240 is lower than a minimum reference point (step 210). Here, the minimum reference point may be 5% of the SOC level, and accordingly, the system controller 260 determines whether the SOC level of the battery 240 is less than 5%.

When the SOC level of the battery 240 is less than 5%, the system operation is stopped, and accordingly, the operation of the battery 240 and the operation of the battery management system (BMS, 250) are stopped (step 220).

The system control unit 260 determines whether electrical energy generated by the power generation device 100 exists in a state in which the system operation is stopped (step 230).

And, when the electric energy generated through the power generation device 100 exists, the system control unit 260 drives the battery management system (BMS, 250) using the electrical energy generated through the power generation device 100 . Let the power be supplied (step 240).

Accordingly, the battery management system (BMS, 250) resumes operation by the supplied driving power, so that the battery 240 is charged using the electric energy generated by the power generation device 100 . (step 250).

Then, the system control unit 260 determines whether or not the charging of the battery 240 is performed above a reference point (step 260). That is, the system controller 260 determines whether the SOC level of the battery 240 has risen to 5% or more or 10% or more.

Next, when the SOC level of the battery 240 rises to 5% or more or 10% or more, the system control unit 260 is the power charged in the battery 240 instead of the power generated through the power generation device 100 . to supply the driving power of the battery management system (BMS, 250) (step 270).

Also, referring to FIG. 17 , the system controller 260 periodically checks the SOC level of the battery 240 by communicating with the battery management system (BMS) 250 (step 300).

Then, the system control unit 260 determines whether the SOC level of the battery 240 is lower than a minimum reference point (step 210). Here, the minimum reference point may be 5% of the SOC level, and accordingly, the system controller 260 determines whether the SOC level of the battery 240 is less than 5%.

If the SOC level is reduced to less than 5%, the system control unit 260 determines whether the current state is a state in which power supply to the load 300 is required (step 320). In this case, this step (step 320) may be performed by the battery management system (BMS, 250).

Then, if the current state is a state requiring power supply to the load 300 , the auxiliary battery 270 is driven and the auxiliary battery 270 is discharged (step 330 ). At this time, in the current stage, the system controller 260 controls the energy storage device 200 by the first controller 261 among the plurality of controllers.

Then, as the auxiliary battery 270 is driven, driving power is supplied to the second control unit 262, and the second control unit 262 is operated by the supplied driving power (step 340). At this time, the first control unit 261 is in a state in which the supply of driving power through the battery 240 is cut off, and thus stops the operation.

In addition, the second control unit 262 operates by driving power supplied through the auxiliary battery 270 , and includes the first converter 210 and the second converter 220 constituting the energy storage device 200 . and controlling the operation of the third converter 230 , thereby supplying power to the load 300 (step 350 ).

According to an embodiment of the present invention, by supplying power to a load composed of a repeater and a camera using the power generated by the power generator, it is possible to supply stable power to the load in an area where independent power is not available.

In addition, according to the embodiment of the present invention, since the final output of the energy storage device is DC power instead of AC power, an inverter that is essential to be included in a load such as a repeater can be eliminated, thereby reducing product cost and slimming the product volume.

In addition, according to an embodiment of the present invention, when the operation of the battery management system is stopped due to the complete discharge of the battery, the driving power of the battery management system is preferentially supplied using the power generated through the power generation device, An additional operation for resuming the operation of the battery management system is unnecessary, and a system abnormality occurring according to the operation stop of the battery management system may be prevented in advance.

According to an embodiment of the present invention, the above-described method can be implemented as processor-readable code on a medium in which a program is recorded. Examples of the processor-readable medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc., and may be implemented in the form of a carrier wave (eg, transmission over the Internet). include

In the embodiments described above, the described configuration and method may not be limitedly applied, but all or part of each embodiment may be selectively combined so that various modifications may be made.

In addition, although preferred embodiments of the present invention are illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the claims Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

100: generator
200: energy storage device
210: first converter 220: second converter
230: third converter 240: battery
250: battery management system 260: system control unit
270: auxiliary battery
300: load

Claims (8)

a power generator that generates electrical energy;
an energy storage device that converts the size of electrical energy generated by the power generator and charges or outputs the converted electrical energy; and
and a load operating by using electric energy output through the energy storage device as driving power,
The energy storage device directly outputs electrical energy of DC power to the load,
The load operates by using electric energy of the DC power output through the energy storage device as driving power,
The energy storage device may include a first converter that receives first DC power through the power generation device and converts the received first DC power into second DC power, and receives the second DC power from the first converter. a battery for receiving and charging, discharging and outputting the charged second DC power; receiving the second DC power from at least one of the first converter and the battery; A second converter that converts third DC power and supplies it to the load, a battery management system that monitors the state of the battery, and receives the state information of the battery through the battery management system, A system control unit for controlling charging and discharging operations of the battery based on the information,
The system controller includes a first controller that is activated under a first condition in which the state of charge of the battery is equal to or higher than a preset level and controls the first and second converters, and a second condition that the state of charge of the battery is less than the preset level. and a second control unit activated to control the first and second converters, and further comprising an auxiliary battery for supplying driving power for activating the second control unit when the state of charge of the battery is the second condition
energy storage system. delete The method of claim 1,
The load is
a repeater for relaying a signal between the mobile terminal and the mobile communication server;
Comprising a camera for taking an image at the location where the repeater is installed
energy storage system. 4. The method of claim 3,
The system control unit,
Checking the driving time information of the repeater, and outputting the second DC power to the second converter only during the driving time of the repeater based on the checked driving time information
energy storage system. The method of claim 1,
The battery management system,
The driving power is supplied through any one of a first path connected to the battery and a second path connected to the first converter,
The system control unit,
When the state of charge of the battery is greater than or equal to a preset level, the driving power of the battery management system is supplied through the first path,
When the state of charge of the battery is less than the preset level, the driving power of the battery management system is supplied through the second path
energy storage system. delete The method of claim 1,
The energy storage device,
a first operation mode of supplying driving power supply to the load by using the electric energy generated by the power generator;
a second operation mode of supplying driving power of the load and charging power of the battery by using the electric energy generated through the power generator;
a third operation mode for supplying driving power of the load using electric energy generated through the power generation device and discharge power of the battery;
a fourth operation mode for supplying charging power of the battery by using the electric energy generated through the power generation device;
a fifth operation mode for supplying driving power of the load using the discharge power of the battery;
operating in any one of the sixth operation modes corresponding to the driving stop state
energy storage system. 4. The method of claim 3,
The repeater is
an amplifier for amplifying the signal;
The amplifier is
It is connected to the output terminal of the second converter and operates by using the third DC power output through the second converter as driving power.
energy storage system.

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